Method for measuring a degree of homogeneity of oils using reverse titration and measuring apparatus using the same

Abstract

The present disclosure relates to an apparatus and a method for measuring miscibility in oil using back titration. The apparatus includes: a flocculation solution storage unit; a flow cell including a UV transmitting member; a dissolving agent storage unit; a UV irradiation unit; and a measurement unit, wherein: a flocculation solution is stored in the flocculation solution storage unit; the flocculation solution circulates between the flocculation solution storage unit and the flow cell; the measurement unit measures the UV transmittance of the flocculation solution while the dissolving agent in the dissolving agent storage unit is supplied to the flocculation solution storage unit; the miscibility in the oil is calculated from the amount of dissolving agent supplied and a change in the UV transmittance measured by the measurement unit; and the miscibility is calculated based on a time point when the slope of increase in the UV transmittance changes.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to Korean Patent Application No. 10-2019-0177997, filed on Dec. 30, 2019, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND ARTTechnical Field[0002]The present disclosure relates to a method and an apparatus for measuring miscibility in oil using back titration.Description of the Related Art[0003]In the process of processing crude oil and its fractions, a problem arises due to decreased miscibility. This problem corresponds to the separation of the wax component or asphaltene component in crude oil, and causes processing problems, including deposition in oil refining process equipment, fouling, and catalyst deactivation.[0004]Asphaltene is frequently separated in the process of upgrading heavy oils such as vacuum residue through pyrolysis or hydrocracking.[0005]In upgraded oil, asphaltene precipitation occurs due to a change in the composition of the oil. Asphaltene prec...

AI Technical Summary

Benefits of technology

[0023]Measurement of the UV transmittance may be performed while the flocculation solution is circulated through the flow cell that measures the UV transmittance, and the method may further include a step of stabilizing the UV transmittance using the flocculant.

Problems solved by technology

In the process of processing crude oil and its fractions, a problem arises due to decreased miscibility.

This problem corresponds to the separation of the wax component or asphaltene component in crude oil, and causes processing problems, including deposition in oil refining process equipment, fouling, and catalyst deactivation.

Asphaltene precipitation causes processing problems, including deposition in equipment, fouling, and catalyst deactivation.

However, this method has a problem in that measurement is not possible if the viscosity is high (55 cSt or higher at 100° C. or more) or the sediment content is high (0.5 wt % or higher).

However, these methods can measure dispersion stability only for crude oil, asphalt, and residual products, which have higher stability than upgraded oil.

These methods have a problem in that, when upgraded oil is tested, clogging occurs or peak observation is impossible.

However, this process has problems in that the representativeness of the sample is decreased due to loss of a certain portion of the sample, and errors in measurement occur due to filter clogging.

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